kernel/reboot: Add do_kernel_power_off()

Add do_kernel_power_off() helper that will remove open-coded pm_power_off
invocations from the architecture code. This is the first step on the way
to remove the global pm_power_off variable, which will allow us to
implement consistent power-off chaining support.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/reboot.c b/kernel/reboot.c
index 96f681f7b20c..892d25aa12df 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -505,6 +505,19 @@ static void do_kernel_power_off_prepare(void)
 }
 
 /**
+ *	do_kernel_power_off - Execute kernel power-off handler call chain
+ *
+ *	Expected to be called as last step of the power-off sequence.
+ *
+ *	Powers off the system immediately if a power-off handler function has
+ *	been registered. Otherwise does nothing.
+ */
+void do_kernel_power_off(void)
+{
+	atomic_notifier_call_chain(&power_off_handler_list, 0, NULL);
+}
+
+/**
  *	kernel_power_off - power_off the system
  *
  *	Shutdown everything and perform a clean system power_off.